A display with selectable viewing angles and methods pertaining thereto are disclosed. The thermal interface is configured to be disposed between an array of heat generating elements and a heat sink with each of the plurality of elevated regions thermally coupled to a corresponding one or more of the array of heat generating elements. There are several approaches for creating holograms from digital graphics. The horn is placed at the rear of the air guide surface. According to the invention it is proposed that the processing apparatus includes a processing means for processing the segment edge, and a carrier apparatus to be fixed in the region of the segment edge for displaceably carrying and guiding the processing means along the segment edge.